Appendix BG Sound Transmission — 2025 California Residential Code
California Residential Code (Title 24, Part 2.5) · 2025 edition · updated 2026-10-19 · California
CBSC: official editions, supplements and errata
Italicized text is a California amendment to the model code, as printed in the official publication.
Cite as: 2025 California Residential Code (Title 24, Part 2.5) Appendix BG · Effective January 1, 2026 · Official source: Building Standards Commission
The provisions contained in this appendix are not mandatory unless specifically a dopted by a state agency or referenced in the adopting ordinance.
See Section 1206 “Sound Transmission” of the California Building Code, Title 24, Part 2, for requirements applicable to structures in this code.
User notes:
About this appendix: Sound transmission relates directly to the psychological and long-term physical well-being of building occupants. Many human activities cannot be accommodated efficiently or comfortably in various types of building spaces without proper attention to the mitigation of sound transmission from other spaces within the building, or from outside of the building. In Appendix BG, attention is specifically paid to the mitigation of sound transmission between dwelling units and other dwelling units and occupancies.
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